Fix lagging

Author: dvlcx

src/ImGui.NET.SampleProgram.XNA/ImGuiRenderer.cs

@@ -261,9 +261,9 @@ private bool TryMapKeys(Keys key, out ImGuiKey imguikey)
                 >= Keys.F1 and <= Keys.F12 => ImGuiKey.F1 + (key - Keys.F1),
                 Keys.NumLock => ImGuiKey.NumLock,
                 Keys.Scroll => ImGuiKey.ScrollLock,
-                Keys.LeftShift or Keys.RightShift => ImGuiKey.ModShift,
-                Keys.LeftControl or Keys.RightControl => ImGuiKey.ModCtrl,
-                Keys.LeftAlt or Keys.RightAlt => ImGuiKey.ModAlt,
+                Keys.LeftShift => ImGuiKey.ModShift,
+                Keys.LeftControl => ImGuiKey.ModCtrl,
+                Keys.LeftAlt => ImGuiKey.ModAlt,
                 Keys.OemSemicolon => ImGuiKey.Semicolon,
                 Keys.OemPlus => ImGuiKey.Equal,
                 Keys.OemComma => ImGuiKey.Comma,